HOW to make part family spin over a certain DATUM axis?

Halo everyone, 

I am actually wondering just as what I type in the subject "HOW to make part family spin over a certain axis?"

Here is the thing that I want to do,

I want to make two parts in the family, according to the datum coordinate, I want to make another part which is exactly the same part as this is, but it spins 180 degree over Z-axis. Do you guys have ideas on how to work this out?

Thanks!